Patent GB-673814-A (GB)
Title: Improvements in or relating to the production of cord material for use in tires, reinforced rubber products, and the like
IPC: C08J5/06
Filed: 1948-01-08
Abstract: A cord material having a denier of at least 500, for use in tyres, reinforced rubber products, and the like, is obtained by applying to a filamentary material a composition comprising a partial ester of a fatty acid containing at least 12 carbon atoms with a hexahydric alcohol or an anhydro derivative thereof, and thereafter twisting at least 1.5 turns per inch to form the cord material.  As an alternative, individual strands of filamentary material may be treated with the composition and then twisted at least 1.5 turns per inch in one direction, and a plurality of such strands may thereafter be twisted together in the opposite direction to form a cord.  The partial ester may be derived from sorbitol, mannitol, dulcitol, sorbitan, mannitan, sorbide, or mannide, and from lauric, myristic, palmitic, stearic, oleic, or ricinoleic acid.  Specified esters are sorbitol tetrastearate, sorbitan monopalmitate, and mannide monooleate.  The sizing composition may also contain sulphated or sulphonated mineral, vegetable or marine oils or higher fatty acids and alcohols containing at least 12 carbon atoms.  Unsulphated oils may be present.  The sulphated or sulphonated compounds may be used in the form of their soluble salts, e.g. their sodium or alkylolamine salts. The sizing or conditioning composition may be in the form of an aqueous dispersion and may be in a concentration of 0.05-5.0 per cent.  Dispersing agents such as triethanolamine may be present.  The conditioning composition may be applied to viscose rayon continuously with the spinning process and before the first drying.  The filamentary material may be cotton, flax, hemp, ramie, regenerated cellulose fibres, cellulose derivative fibres, or fibres of nylon, polyvinyl compounds, polyvinylidene compounds, or polystyrene.  The cord structures obtained have improved fatigue resistance and high flex life, heat resistance and tensile strength.  They exhibit good adhesion to rubber.  In an example, sorbitan monopalmitate is melted and then mixed with triethanolamine.  The mixture is then dispersed in water.  The diluted dispersion is applied to a freshly spun viscose rayon yarn.  The yarn is dried and then twisted 1.5 turns per inch in one direction.  The twist is then increased to 14 turns and then two such strands are twisted in the opposite direction by 12.5 turns per inch.  In another example, sorbitan monopalmitate containing triethanolamine is mixed with a mixture of mineral oil, sulphonated castor oil and sulphonated mineral oil.  The mixture is stirred, a bactericide such as o-phenyl phenol is added, and the mixture is then dispersed in water.  The dispersion is applied to viscose rayon, which is then twisted and plied to form a cord. Specification 625,096 is referred to.ALSO:A lubricating composition, for application to filamentary material (see Group IV(c)), prior to twisting to form cord material for reinforced rubber products, comprises a partial ester of a fatty acid containing at least 12 carbon atoms with a hexahydric alcohol or an anhydro derivative thereof.  The partial ester may be derived from sorbitol, mannitol, dulcitol, corbitan, manitan, sorbide, or mannide, and from lauric, myristic, palmitic, stearic, oleic, or ricinoleic acid.  Specified esters are sorbitol tetrastearate, sorbitan monopalmitate, and mannide monooleate. The composition may contain mineral, vegetable or marine oils, or sulphated or sulphonated mineral vegetable, or marine oils, or higher fatty acids and alcohols containing at least 12 carbon atoms.  The sulphated or sulphonated compounds may be used in the form of their solube salts, e.g. their sodium or alkylolamine salts.  The composition may be in the form of an aqueous dispersion and may be in a concentration of 0.05-5.0 per cent. Dispersing agents such as triethanolamine may be present.  The filamentary material may be cotton, flax, hemp, ramie, regenerated cellulose fibres, cellulose derivative fibres, or fibres of nylon, polyvinyl compounds, polyvinylidene compounds or polystyrene.  In an example, sorbitan monopalmitate is melted and then mixed with triethanolamine.  The mixture is then dispersed in water.  The diluted dispersion is applied to a freshly spun viscose rayon yarn.  The yarn is dried and then twisted 1.5 turns per inch in one direction.  The twist is then increased to 14 turns and then two such strands are twisted in the opposite direction by 12.5 turns per inch.  In another example, sorbitan monopalmitate containing triethanolamine is mixed with a mixture of mineral oil, sulphonated castor oil, and sulphonated mineral oil.  The mixture is stirred, a bactericide such as o-phenyl phenol is added, and the mixture is then dispersed in water.  The dispersion is applied to viscose rayon which is then twisted and plied to form a cord.  Specification 625,096, [Group IV(c)], is referred to.